I found this GitHub API that scraps findagrave.

https://github.com/pirtleshell/scrape-a-grave

It means you can grab all the data from FAG into a database. A list of dead peoplele etc.

Now I've also found this voter checker from Google though I'm not exactly sure what it is.

https://developers.google.com/civic-information/docs/v2/elections/voterInfoQuery

Or maybe there is an API of faster way to check this site

https://myvote.wi.gov/en-us/TrackMyBallot

So if you put these together you can cross reference dead people from FAG to results on the gov or Google web site. This would allow you to quickly check if what dead people have voted.